EP 0022438 B1 19830720 - METHOD FOR DETECTING AEROSOLS IN AIR OF A CONTROL ZONE AND APPARATUS FOR ITS PERFORMING
Title (en)
METHOD FOR DETECTING AEROSOLS IN AIR OF A CONTROL ZONE AND APPARATUS FOR ITS PERFORMING
Publication
Application
Priority
EP 79200390 A 19790713
Abstract (en)
[origin: EP0022438A1] 1. Process for detecting aerosols in air situated in a test zone, wherein, in a first step, a photosensitive element (122) which monitors the test zone (14) is illuminated in order that it may be biased and supply an electrical voltage signal and, immediately after termination of the first step, in a second step, the test zone (14) is illuminated, any aerosol present in the test zone reflecting light towards the photosensitive element (122), characterized in that in a third step, the duration, dependent upon the presence of aerosol in the test zone, of the trailling edge of the electrical voltage signal is measured after termination of the first step and simultaneously with the second step, and that an alarm is set off when the measured duration of the trailling edge of the electrical voltage signal exceeds a certain value.
IPC 1-7
IPC 8 full level
G01N 21/53 (2006.01); G08B 17/107 (2006.01)
CPC (source: EP)
G01N 21/53 (2013.01); G08B 17/107 (2013.01)
Designated contracting state (EPC)
AT CH DE FR IT NL SE
DOCDB simple family (publication)
EP 0022438 A1 19810121; EP 0022438 B1 19830720; AT E4251 T1 19830815; DE 2965907 D1 19830825
DOCDB simple family (application)
EP 79200390 A 19790713; AT 79200390 T 19790713; DE 2965907 T 19790713